Beta-delayed charged-particle spectroscopy using TexAT

Bishop, J.; Rogachev, G. V.; Ahn, Sang Chul; Aboud, E.; Barbui, M.; Baron, P.; Bosh, A.; Delagnes, É.; Hooker, J.; Hunt, Curtis; Jayatissa, H.; Koshchiy, E.; Malecek, Rachel; Marley, S. T.; O’Dwyer, R.; Pollacco, E.; Pruitt, C. D.; Roeder, B. T.; Saastamoinen, A.; Sobotka, L. G.; Upadhyayula, S.

doi:10.1016/j.nima.2020.163773

Cited by 9 publications

(29 citation statements)

References 27 publications

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“…The TexAT TPC was filled with 50.0 (±0.2) Torr of CO 2 gas which was refreshed at a rate of 50 sccm. The Thick Gas Electron Multiplier 6 were combined with Micromegas for an overall gas gain of 5000. The field cage voltage provided an electric field of 69 V cm −1 , drifting ionised electrons with a velocity of 0.75 cm μ s −1 .…”

Section: Resultsmentioning

confidence: 99%

Neutron-upscattering enhancement of the triple-alpha process

et al. 2022

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The neutron inelastic scattering of carbon-12, populating the Hoyle state, is a reaction of interest for the triple-alpha process. The inverse process (neutron upscattering) can enhance the Hoyle state’s decay rate to the bound states of 12C, effectively increasing the overall triple-alpha reaction rate. The cross section of this reaction is impossible to measure experimentally but has been determined here at astrophysically-relevant energies using detailed balance. Using a highly-collimated monoenergetic beam, here we measure neutrons incident on the Texas Active Target Time Projection Chamber (TexAT TPC) filled with CO2 gas, we measure the 3α-particles (arising from the decay of the Hoyle state following inelastic scattering) and a cross section is extracted. Here we show the neutron-upscattering enhancement is observed to be much smaller than previously expected. The importance of the neutron-upscattering enhancement may therefore not be significant aside from in very particular astrophysical sites (e.g. neutron star mergers).

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Section: Resultsmentioning

confidence: 99%

Neutron-upscattering enhancement of the triple-alpha process

et al. 2022

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“…Silicon charged-particle detectors typically have an absolute energy resolution of 30-50 keV, meaning that differentiating between the three α-particles using such detectors can be difficult. An alternative approach is to measure the decay of the Hoyle state in a Time Projection Chamber (TPC) such as those in references [41][42][43]. In these cases, the relative angles between the three α-particles could be used to differentiate the two decay channels.…”

Section: Carbon-12mentioning

confidence: 99%

The Hoyle Family: The Search for Alpha-Condensate States in Light Nuclei

et al. 2020

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Our present understanding of the structure of the Hoyle state in 12 C and other near-threshold states in α-conjugate nuclei is reviewed in the framework of the α-condensate model. The 12 C Hoyle state, in particular, is a candidate for α-condensation, due to its large radius and α-cluster structure. The predicted features of nuclear α-particle condensates are reviewed along with a discussion of their experimental indicators, with a focus on precision break-up measurements. Two experiments are discussed in detail, firstly concerning the break-up of 12 C and then the decays of heavier nuclei. With more theoretical input, and increasingly complex detector setups, precision break-up measurements can, in principle, provide insight into the structures of states in α-conjugate nuclei. However, the commonly-held belief that the decay of a condensate state will result in N α-particles is challenged. We further conclude that unambiguously characterising excited states built on α-condensates is difficult, despite improvements in detector technology. This contribution has been presented during the ceremony of the Few-Body Systems Award for young professionals.

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Conclusion:Four previously unknown α-decaying excited states were observed in 13 N at 11.3 MeV, 12.4 MeV, 13.1 MeV and 13.7 MeV and the decay modes for these states were established.

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confidence: 99%

First observation of the $β$3$α$p decay of $^{13}\mathrm{O}$ via $β$-delayed charged-particle spectroscopy

Bishop¹,

Rogachev²,

Ahn³

et al. 2023

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Background: The β-delayed proton-decay of 13 O has previously been studied, but the direct observation of β-delayed 3αp decay has not been reported.Purpose: Rare 3αp events from the decay of excited states in 13 N provide a sensitive probe of cluster configurations in 13 N.Method: To measure the low-energy products following β-delayed 3αp-decay, the TexAT Time Projection Chamber was employed using the one-at-a-time β-delayed charged-particle spectroscopy technique at the Cyclotron Institute, Texas A&M University.Results: A total of 1.9 × 10 5 13 O implantations were made inside the TexAT Time Projection Chamber. 149 3αp events were observed yielding a β-delayed 3αp branching ratio of 0.078(6)%. Conclusion:Four previously unknown α-decaying excited states were observed in 13 N at 11.3 MeV, 12.4 MeV, 13.1 MeV and 13.7 MeV and the decay modes for these states were established. We demonstrate that clustering must dominate the structure of these states to exhibit the observed decay branching ratios.

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Beta-delayed charged-particle spectroscopy using TexAT

Cited by 9 publications

References 27 publications

Neutron-upscattering enhancement of the triple-alpha process

Neutron-upscattering enhancement of the triple-alpha process

The Hoyle Family: The Search for Alpha-Condensate States in Light Nuclei

First observation of the $β$3$α$p decay of $^{13}\mathrm{O}$ via $β$-delayed charged-particle spectroscopy

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